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IST-2220.IC01.01
Red LED "ALARM":
Green LED "ON":
Yellow LED "FAULT":
NOTES ON THE AVAILABLE MODELS
The TS220 IC2 model is calibrated with a full scale of 2% volume (= 20000ppm) of CO
The Carbon dioxide (synonym: Carbonic anhydride), is an odourless, colourless gas, heavier than air, its density rela-
tive to air is 1.5 and this gas can accumulate at the bottom causing a dangerous lack of oxygen. Its TWA is
5000ppm = 0.5% volume (Time-Weighted Average) and STEL 15000ppm = 1.5% volume (Short Term Exposure Limit).
Carbon dioxide is a fundamental component of Earth's atmosphere in clean air is about 400ppm and is necessary
to the life processes of plants (photosynthesis) and animals, but, for the earth's atmosphere, it is also a greenhouse
gas. The carbon dioxide is produced by combustion processes of petroleum and coal (thermal power plants and
vehicles), as a by-product of fermentation (wine, beer and organic substances), or emitted by natural processes
and by exhalations from the ground. Is used in agriculture or horticultural to increase the growth of plants, through
increase of its concentration in greenhouses, etc.
OPERATIONAL DESCRIPTION
The NDIR sensor is temperature compensated, it can be used in polluted environments without a significant deg-
radation of performance and also works in environments with oxygen deficiency.
The operational mode of the NDIR sensor is based on the physical principle that certain types of gases absorb
certain wavelengths of infrared energy. In practice, a filament generates infrared energy, which concentrated,
passes through the gas to be measured, and arrives at the detector. The detector is double, the first, defined as
"active", has an optical filter, selective to the gas to be measured, while the second, called "reference" has a filter
with a different wavelength. The active detector is used to detect the gas, while the reference detector provides the
"zero" value. The difference signal between the two detectors provides the value of the gas concentration. The ad-
vantage of this technique is that it is selective for gases such as carbon dioxide, which is difficult to measure with
other methods, and also has the advantage of compensating, in time, the changes of detector sensitivity. The only
interference, may be given from presence of water vapour, which absorbs infrared.
Preheating: when powered, the sensor needs a time of preliminary heating of about 60 seconds. During this pe-
riod the yellow LED "FAULT" flashes. After this period, the yellow LED light off, the green LED "ON" illuminates to in-
dicate normal functioning. After this period the unit is able to detect gas even if it attains the optimum stability con-
ditions after about 10÷30 minutes continual functioning (only after this time, can be made the calibration check).
Normal operation
: the green LED "ON" should be light on.
Alarm: when the gas concentration exceeds the value indicated in the table, the
red LED illuminates (only if it be activate by Dip-Switch no.4 set to ON).
: the Yellow LED (FAULT) illuminates and the "S" output falls down to 0mA. (The different faults are listed below).
Faults
Yellow LED illuminates each 3 seconds (with green LED activate): this happens when the "Sensor" has overcome
its period of life (about 5 years) and its correct operation is not longer guaranteed. The detector keeps on operating
normally but it is necessary, as soon as possible, replace and / or send it back to the supplier to replace the "Sensor"
with a new one.
Yellow LED activate, green LED off (0mA output signal): this signal different kind of faults. 1) The Dip Switch set
up is wrong, please verify (
rected) Performed the checks turn off then on the device. If the condition persists, please replace the unit and/or
send it back to the supplier for repair.
Yellow and green LED activates (0mA output signal): this happens when the "Sensor" is not working. First try to
turn off then on the device. If the condition persists, please replace the unit and/or send it back to the supplier for
repair.
INSTALLATION
The detectors must be installed, positioned and carried out maintenance, following all the applicable national regu-
lations for electrical installations and safety standards of the plant.
Fig. 1
Mounting: The
shows the instrument size. The unit must be positioned vertically. The cable gland, normally
should be positioned downward, but the base of the housing can be rotated so that the cable gland be upward.
TS210 IC2 positioning: should be fixed at 20-30 cm from the floor (CO
Electrical Connection
(see
table
1. Normally use a tree wire shielded cable. The shield should be grounded only by the Central side.
in
The terminals (+ - S), are polarized plug-in type, it is necessary to extract them to make the connection.
Note: Dip-Switch should be set with instrument powered off. Dip-Switch 1 settled ON, and the others in
OFF, will be activates ALARM Red LED indication (see Table 2).
Important: Once installation is completed, power up the unit, it is not necessary to make any adjustment. Wait
about 20 to 30 minutes and then, only if it is requested, carry out the "Operation Check"
COMPATIBILITY WITH OTHER CENTRAL UNITS: In case of a central unit other then Tecnocontrol, please verify
the max load resistor as shown in
WARNING
Average life: The sensitive element used in this detector has an excellent stability in time, the sensor's life is more
than 5 years from the date of installation. After this period the yellow LED "FAULT" flashes every 3 seconds, this is
TECNOCONTROL S.r.l. Via Miglioli 47 SEGRATE ( MI ) ITALY
Istruzione / User's Manual / Manuel d'utilisation
0.25%Vol (= 2500ppm) alarm indication.
normal working condition
the sensor should be faulty, disconnected or expired.
see Table
2). 2) The "Sensor" is not working, (fault sensor or no communication or uncor-
Fig.2): the maximum distance to install each detector from the Gas Central Unit is show
Fig.
4. We suggest using 24VDC power supply.
2
TS210 IC2
0.25 % vol CO
gas is heavier than air).
2
(see 'Test and
Tel. +39 02 26922890 - Fax +39 02 2133734
Pag.4/8
2
Calibration).
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